EP1343298B1 - Network-connecting apparatus and method for providing direct connections between network devices in different private networks - Google Patents
Network-connecting apparatus and method for providing direct connections between network devices in different private networks Download PDFInfo
- Publication number
- EP1343298B1 EP1343298B1 EP03004855A EP03004855A EP1343298B1 EP 1343298 B1 EP1343298 B1 EP 1343298B1 EP 03004855 A EP03004855 A EP 03004855A EP 03004855 A EP03004855 A EP 03004855A EP 1343298 B1 EP1343298 B1 EP 1343298B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- network
- address
- private
- tunnel
- public
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/45—Network directories; Name-to-address mapping
- H04L61/4505—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
- H04L61/4511—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2101/00—Indexing scheme associated with group H04L61/00
- H04L2101/60—Types of network addresses
- H04L2101/604—Address structures or formats
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/25—Mapping addresses of the same type
- H04L61/2503—Translation of Internet protocol [IP] addresses
- H04L61/2521—Translation architectures other than single NAT servers
- H04L61/2535—Multiple local networks, e.g. resolving potential IP address conflicts
Definitions
- This disclosure is related to a network-connecting apparatus and method. Specifically, techniques related to a network-connecting apparatus and method for providing direct connections between network devices in a first arbitrary private network and network devices in a second arbitrary private network are taught.
- a device for IP communication over the Internet requires an IP address that is unique and distinguishable from another device.
- the IP addresses that are presently allocated and used based on a code that is 32 bits long.
- a scheme of using private IP addresses has been developed and employed to overcome this problem.
- Private IP addresses are allocated on the condition that certain parts of the entire IP addresses can be used for tests or in local areas. Therefore these private addresses are freely usable for certain purposes.
- regulations prohibit packets having a private IP address from being transferred to a public network.
- An example of such a public network is the Internet.
- An IP address that can be used in the public networks is called a public IP address.
- Devices using a private IP address have various limitations.
- the devices using public IP address have various other limitations, which could be different from the ones for devices with private IP addresses.
- Private and public networks are connected to one another through a gateway.
- Each gateway is dynamically allocated one public IP address. More public IP addresses are not allocated at least because that would increase the costs. That is, an Internet Service Provider (ISP) provides a public IP address for a gateway. This public IP address is required for connecting the gateway to the public network. Further, in a private network having a plurality of network devices, a public IP address is allocated to (and used for) the gateway only. For network devices other than the gateway, arbitrary private IP addresses are internally allocated. For ensuring complete communication access with other network devices it is desirable that a device that uses a private IP address performs at least the following different tasks.
- ISP Internet Service Provider
- NAT network address translation
- NAPT network address port translation
- This disclosure teaches a network-connecting apparatus for a first private network having a first network device.
- the apparatus comprises a direct connection part for providing a direct connection in response to a connection request from the first network device, said request being a request to connect to a second network device in a second private network.
- an address change part is provided for changing subnet numbers of origination and destination addresses of a packet transferred outside the first private network through the direct connection.
- the direct connection part comprises an address acquisition part for acquiring a public IP address of the second private network from a domain name management server based on a domain name of the second network device received from the first network device, and for acquiring a private IP address of the second network device based on the received domain name.
- a connection management part is provided for connecting to the second private network based on the acquired public IP address and forming a tunnel with the second private network.
- an address mapping part is provided for converting the acquired public IP address and the acquired private IP address into an address system used in the first private network in case an address system used for the public IP address of the second private network is different from the address system used for the public IP address of the first private network.
- the address change part comprises a number acquisition part for receiving a unique tunnel number from the second private network, said tunnel number being allocated to the tunnel.
- a change part is provided for changing the subnet number of the origination address of the packet transferred outside the first private network through the direct connection to the tunnel number, and for changing the destination address of the packet to the acquired private IP address.
- a registration request part for requesting a registration of a public IP address from a domain name management server, said public address being allocated from a unique domain name and internet service providing device through a communication network.
- the direct connection part includes a connection management part for forming a tunnel with the second private network having the second network device.
- the address change part comprises a number assignment part for assigning a unique tunnel number to the tunnel.
- a change part is provided for changing a subnet number of the origination address of the packet transferred outside the first private network through the direct connection to the tunnel number, and for changing the destination address of the packet to a private IP address of the first network device.
- the number assignment part assigns a number that is not a subnet number of the private IP address allocated to the second network device.
- an authentication part for authenticating the second network device, wherein the direct connection part provides a direct connection in case of receiving a connection approval signal from the authentication part.
- Another aspect of the disclosed teaching is a method for establishing connection between a first network device in a first private network and a second network device in a second private network.
- the method comprises providing a direct connection in response to a connection request from the first network device to be connected to the second network device.
- a private IP address of the second network device is acquired.
- the subnet number of an origination address of a packet transferred outside the first private network through the direct connection is changed.
- a destination address of the packet is changed to the private IP address of the second network device.
- the direct connection includes acquiring a public IP address of the second private network from a domain name management server based on a domain name of the second network device received from the first network device. Connection is made to the second private network based on the acquired public IP address. A tunnel is formed with the second private network.
- the direct connection further includes receiving a unique tunnel number allocated to the tunnel from the second private network.
- the subnet number of the origination address of the packet is changed to the tunnel number.
- the acquired public IP address and acquire private IP address are mapped into an address system used in the first private network address in case the address system used for the public address by the first private network is different from an address system used for the public IP address in the second private network.
- a domain name management server prior to direct connection, is requested to register a public IP address allocated from a unique domain name and internet service providing device through a communication network.
- the direct connection includes forming a tunnel with the second private network having the second network device.
- a unique tunnel number is allocated to the tunnel.
- Fig. 1 shows a structure of a network formed with network-connecting apparatuses according to an exemplary implementation of the disclosed teachings.
- FIG. 1 an Internet Service Provider (ISP) 110, a Domain Name Server (DNS) 120, a Remote Server (RS) 130, a Remote Client (RC) 140, and plural gateways 152, 162, and 172, are connected to a public network 100.
- This public network could be the Internet.
- Gateway 152 acts as a passageway connecting the public network 100 and private network 150.
- 162, and 172 act as passageways connecting private networks, 160, and 170, respectively, to the public network 100.
- Private networks 150, 160, and 170 are connected to the gateways 152, 162, and 172 respectively. They are also connected to network devices 154a to 154n, 164a to 164n, and 174a to 174n, respectively.
- the ISP 110 dynamically allocates public IP addresses in order to enable the respective gateways 152, 162, and 172 to connect to the Internet 100. Dynamic allocation in this context means that the same address need not be allocated to a gateway each time a new allocation is performed for the gateway.
- the domain name server 120 links an internet address to a name.
- the address is denoted by numbers, whereas the name is usually denoted by characters familiar to users. That is, the domain name server 120 stores and provides, to users, relations between continuously varying public IP addresses of the gateways 152, 162, and 172 and unique character names. Because of this, the users can easily recognize the public IP addresses of the gateways 152, 162, and 172 to which the users request a connection based on the names of corresponding gateways 152, 162, and 172.
- the RS 130 is a general remote server providing services through the Internet 100.
- the RC 140 is a general client devices using a public IP address.
- the gateways 152, 162, and 172 are network-connecting apparatuses connecting the public network 100 and the private networks 150, 160, and 170. It should be noted that the gateways have both public IP addresses and private addresses.
- the gateways 152, 162, and 172 employ a public IP address while connecting to the public network 100.
- these gateways use private IP addresses while connecting to the private networks 150, 160, and 170.
- the respective network devices 154a to 154n, 164a to 164n, and 174a to 174n form part of the private networks 150, 160, and 170, respectively. They use private IP addresses and they can be operated as servers or clients.
- Fig. 2 is a block diagram showing an internal structure of a network-connecting apparatus according to an exemplary implementation of some aspects of the disclosed teachings.
- the gateway 152 has a public network interface part 205, a private interface part 210, a routing part 215, a network address port translation (NAPT) part 220, a VPN part 225, a DNS part 230, an IP part 235, a direct connection part 240, an address change part 250, an address mapping part 260, a user authentication part 265, an encoding part 270, a first storage part 275, a second storage part 280, a third storage part 285, and a control part 290.
- NAPT network address port translation
- the public network interface part 205 is connected to the internet 100 through the ISP 110 and provides an interface with a broadband access network.
- the broadband access could be provided through Asymmetric Digital Subscriber Line (ADSL), a Cable Modem, and the like.
- the private network interface part 210 provides an interface with the private network 150 and employs an interface device with a LAN network having IP transfer capacity.
- the private interface part 210 modifies the address part of the packet from or to the IP part 235 with the information from the direct connection part 240. However, in other cases, the packets from or to the IP part 235 are not modified.
- the IP part 235 is in charge of receiving and transferring data between the network devices 154a to 154n in the private network 150 and the network devices 154a to 154n joined in the Virtual Private Network (VPN), also the IP part 235 is in charge of receiving and transferring data between the devices 154a to 154n in the private network 150 and the RC 140 in public network.
- the routing part 215 performs a function of transferring data received or data to be transferred to the right destinations.
- the NAPT part 220 is positioned between the public interface part 205 and the IP part 235 and translates private IP addresses into a public IP address in order to enable the plural network devices 154a to 154n that form part of the private network 150 to be connected to the Internet using only one shared public IP address.
- the information required for the translation are stored and updated in a NAPT translation table that is stored in the first storage part 275.
- the VPN part 225 forms a tunnel in order for the RS 130 and RC 140 connected to the Internet 100 to be connected to the private network 150. Likewise the VPN part 225 also forms a tunnel in order for the network devices 164a to 164n in a second private network 160 to be connected to the private network 150. In addition, the VPN part 225 allocates private IP addresses to the RS 130, the RC 140, and the network devices 164a to 164n in the second private network 160 which are connected through the tunnel. Further, the VPN part 225 also forms a tunnel for the gateway 160 of the second private network 160 in order for the network devices 154a to 154n that form part of the private network 150 to be connected to the second private network 160.
- the DNS part 230 operates as a DNS server for the private network 150. Further, on initializing the system, the DNS part 230 requests a public IP address from the ISP 110. The DNS part 230 then registers the public IP address allocated from the ISP 110 and correlates it with a unique domain name of the private network 150. The public IP address and the name are registered with the domain name server 120 connected to the internet 100.
- the direct connection part 240 provides direct connections between the network devices 154a to 154n inside the private network 150 and the network devices 164a to 164n that are outside the private network 150 and form part of a second private network 160.
- the direct connection part 240 has an address acquisition part 242 and a connection management part 244.
- the address acquisition part 242 acquires a public IP address from the Domain Name Server 120. For example, 208.229.23.30, is a public IP address of the private network 160 to be connected. This could be based on a domain name of the network device 164a, such as "lion.printer" that formed part of the network 160 that is waiting to be connected. This domain name is received from the network device 154a that forms part of the private network 150.
- the connection management part 244 is connected to a gateway of the private network 160 (that is waiting to be connected), on a basis of the acquired IP address, to form a tunnel.
- the address acquisition part 242 transfers the domain name of the network device 164a (the device whose connection is desired) to the gateway of the to-be-connected private network 160.
- the address acquisition part 242 receives a private IP address of the corresponding network device 164a from the corresponding gateway 162.
- the address acquisition part 242 changes a subnet number of the private IP address of the corresponding network device 164a to a tunnel number.
- the address acquisition part 242 then transfers the tunnel number to the network device 154a requesting the connection.
- connection-requesting network device 154a grasps that IP packets to be sent to the to-be-connected network device 164a and then transfer them to the gateway 162 of the private network 160 to which the network device 164a belongs.
- the transfer is done using the process of Address Resolution Protocol (ARP) and is based on the changed private IP address of the to-be-connected network device 164a that is transferred to 154a.
- ARP Address Resolution Protocol
- physical network addresses should be obtained from the respective hosts and then matched with IP addresses.
- the ARP is a protocol that performs a broadcast function in a network such as the Ethernet.
- the private IP address of the to-be-connected network device 164a received from the gateway 162 of the private network to be connected is recorded in a translation table stored in the second storage part 275.
- the private IP address of the connection-requesting network device 154a, and the tunnel number are also recorded in the translation table stored in the second storage part 275.
- the connection-requesting network device 154a produces an IP packet designating a destination address. This designating address is formed by changing a subnet number of the private IP address of the to-be-connected network device 164a changed in a subnet number. It then makes a transfer request.
- the address change part 250 changes a subnet number of an originating address of the produced IP packet to a tunnel number. It also changes the destination address of the produced IP packet to a private IP address of the to-be-connected network device 154a. In the meantime, the address change part 250 reads out the private IP address of the to-be-connected network device 164a, the private IP address of the connection-requesting network device 154a, and the tunnel number from the translation table stored in the second storage part 280 and performs an address change process.
- the address change part 250 has a number acquisition part 252, a number assignment part 254, and a change part 256.
- the number acquisition part 252 receives a unique tunnel number which is assigned to a tunnel formed from the gateway 162 of the to-be-connected private network 160.
- the number assignment part 254 provided in the gateway 162 of the to-be-connected private network 160 assigns the tunnel number.
- the gateway 162 of the to-be-connected private network 160 assigns a tunnel number
- the gateway 162 considers a sub-netting method of the private network 160 corresponding to the gateway 162. That is, subnet numbers not assigned to the network devices 164a to 164n existing in the private network 160 corresponding to the gateway 162 are assigned as tunnel numbers. It is preferable that the number acquisition part 252 and the number assignment part 254 must cooperate to make the unique tunnel number.
- the change part 256 changes the origination and destination addresses of an IP packet
- gateway 162 may exchange sub-netting information with a connection-requesting gateway 152. This exchange of information is done such that the subnet numbers not used in both the gateways 152 and 162 can be used as tunnel numbers. In either case, it is desirable that the subnet numbers of private IP addresses used in the respective private networks 150 and 160 are fixed. This is done such that the subnet numbers not allocated in the respective private networks 150 and 160 can be allocated as tunnel numbers.
- IP packet header Information on the origination and destination addresses is generally included in an IP packet header.
- some network codes require that information about an address is included in a payload portion of an IP packet. Therefore, it is desirable that the gateway 152 has a packet identification part (not shown). This packet identification part can extract IP address information from an IP packet transferred from a private network in accordance with such network codes.
- An IP packet in which an address change is completed is transferred to the gateway 162 of the to-be-connected private network 160 through a tunnel formed between the respective private networks 150 and 160.
- the gateway 162 of the to-be-connected private network 160 transfers a received IP packet to the to-be-connected network device 164a.
- an IP address system used in the private network 150 to which the connection-requesting network device 154a belongs is different from an IP address system used in the private network 160 to which the to-be-connected network device 164a belongs, for example IPv4.
- the address mapping part 260 converts the address into a particular IP address system such as IPv6.
- the conversion of an IP address system employs a method using a router and a domain name server which support both IPv4 and IPv6. It also employs a method for encapsulating an IPv6 diagram in an IPv4 packet, and so on. Detailed descriptions of these methods are omitted since they are well known to one skilled in the art.
- a user authentication part 265 carries out an authentication process when connection requests originate from network devices 164a to 164n, RS 130, and RC 140, that do not form part of the private network 150.
- User information necessary for user authentications is stored in the third storage part 285.
- the direct connection part 240 forms a tunnel and provides a direct connection in case of receiving a connection approval signal for a network device such as the network device 164a requesting a connection from the user authentication part 265.
- the encoding part 270 encodes data in case such additional security is required for packets communicating with devices connected to the Internet 100. Further, the encoding part 270 decodes the data received through the Internet 100. Information necessary to carry out the encoding and decoding of packets in the encoding part 270 is stored in the third storage part 285. The control part 290 controls the operations of the respective constituents of the overall system.
- Fig. 3 shows an IP address structure and a subnet mask according to the IPv4 protocol.
- an IP address is structured with a network address part 310 and a host address part 320.
- a network is normally separated internally into several segments for better management.
- the host address part 320 of the IP address 300 is divided into a subnet number part 330 and a host number part 340.
- the subnet mask 350 is used to designate a broadcasting range.
- the communication method of the Local Area Network (LAN) is the broadcasting method, separating one network class into plural network segments using subnet masking. This enables IP addresses to be efficiently used.
- Fig. 3 shows a subnet mask 350 set to 255.255.255.0. Therefore, the subnet number part 330 of a 32-bit IP address 300 is included in a network number.
- Fig. 4 shows a process of direct connections among network devices existing in different private networks by a network-connecting method according to an exemplary implementation of some aspects of the disclosed teachings.
- a TV 405 that is part of a network A 410 having a domain name of tiger.tv requests a direct connection to a printer 465 existing in a network B 460 and having a domain name of lion.printer (S400). Both the TV 405 and the printer 465 have network functions.
- the TV 405 transfers the domain name of the printer 465 to a gateway A and makes the request.
- the gateway A 420 transfers the domain name of the printer 465 to a domain name server 440 holding public IP addresses of the network A 410 and network B 460. It then requests a public IP address of a private network to which the printer 465 belongs (S405).
- the domain name server 440 provides the public IP address of the network B corresponding to the domain name of the printer 465 transferred from the gateway A 420 to the gateway A 420 (S410).
- the gateway A 420 connects to the gateway B 450 and requests a tunnel formation (S415).
- the gateway B 450 creates a tunnel having a unique tunnel number TN (S420). Prior to creating the tunnel, the gateway B 450 carries out a user authentication process and checks if TV 405 requesting the connection has the necessary connection authority. The tunnel is created only if such an authorization exists.
- the gateway B 450 allocates the subnet numbers not assigned to network devices, existing in the network B 460, as tunnel numbers. If the respective networks 410 and 460 use the same sub-netting method, the subnet numbers not allocated in all of the respective networks 410 and 460 may be allocated as tunnel numbers.
- the gateway B 450 When the gateway B 450 allocates a tunnel number, the gateway B 450 exchanges sub-netting information with the gateway A 420 and then allocates as a tunnel number a subnet number not used in all of the respective networks 410 and 460.
- the subnet number parts of private IP addresses used in the respective networks 410 and 460 are preferably fixed so that a subnet number not assigned in the respective networks 410 and 460 can be allocated as a tunnel number.
- the gateway A 420 requests a private IP address of the printer 465 to the gateway B 460 (S425).
- the gateway B 460 in response to the request, provides a private IP address 172.16.0.9 of the printer 465 to the gateway B 420 (S430).
- the gateway A 420 converts the provided subnet number of the private IP address of the printer 465 to a tunnel number and then transfers the tunnel number to the TV 405 (S435).
- the TV 405 requests a transfer of IP packets in which its own private IP address and the converted private IP address of the printer 465 transferred from the gateway A 420 are recorded as the origination and destination addresses respectively (S440).
- the origination and destination addresses of the IP packet transferred to the gateway A 420 from the TV 405 are 172.16.0.6 and 172.16.TN.9 respectively.
- TN is the allocated tunnel number.
- the gateway A 420 converts a subnet number of the origination address of the IP packet received from the TV 405 to a tunnel number, changes the destination address to a private IP address of the printer 465, and transfers the IP packet to the gateway B 450 (S445). Through such a conversion process, the origination and destination addresses of the IP packet transferred to the gateway B 450 from the gateway A 420 are converted into 172.16.TN.6 and 172.16.0.9 respectively.
- the gateway B 460 transfers the received IP packet to the printer 465 (S450).
- the respective gateways 420 and 460 carries out the steps S440 to S450 to provide direct communications between the TV 405 and the printer 465 (S455 to S465).
- Fig. 5 shows an IP packet passing through a tunnel formed between the gateway A 420 and the gateway B 460.
- the respective gateway 420 and 460 processes the exchange of an IP packet header tunnel number and a subnet number in the packet header of the TV/printer in a private network.
- the network-connecting apparatus and method may be applied to a direct connection among network devices existing in a network having an address system according to the IPv6 and to a direct connection among network devices existing in a network having different address systems.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2002-0012219A KR100485801B1 (ko) | 2002-03-07 | 2002-03-07 | 서로 다른 사설망에 존재하는 네트워크장치들 간의직접접속을 제공하는 망접속장치 및 방법 |
KR2002012219 | 2002-03-07 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1343298A2 EP1343298A2 (en) | 2003-09-10 |
EP1343298A3 EP1343298A3 (en) | 2004-06-30 |
EP1343298B1 true EP1343298B1 (en) | 2005-06-22 |
Family
ID=27751993
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03004855A Expired - Fee Related EP1343298B1 (en) | 2002-03-07 | 2003-03-05 | Network-connecting apparatus and method for providing direct connections between network devices in different private networks |
Country Status (6)
Country | Link |
---|---|
US (1) | US7290060B2 (ko) |
EP (1) | EP1343298B1 (ko) |
JP (1) | JP3854584B2 (ko) |
KR (1) | KR100485801B1 (ko) |
CN (1) | CN100366033C (ko) |
DE (1) | DE60300871T2 (ko) |
Families Citing this family (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69401040T2 (de) * | 1993-07-12 | 1997-06-05 | Nec Corp | Gehäusestruktur für Mikrowellenschaltung |
JP4010830B2 (ja) * | 2002-03-05 | 2007-11-21 | 富士通株式会社 | 通信装置およびネットワークシステム |
KR20030075810A (ko) * | 2002-03-20 | 2003-09-26 | 유디에스 주식회사 | 공인네트워크와 비공인네트워크 사이에서의 데이터 통신시스템 및 그 방법 |
TW588532B (en) * | 2002-03-29 | 2004-05-21 | Realtek Semiconductor Corp | Management device and method of NAT/NAPT session |
TWI232655B (en) * | 2002-05-07 | 2005-05-11 | Realtek Semiconductor Corp | Device and method for network address-port translation |
KR100485769B1 (ko) * | 2002-05-14 | 2005-04-28 | 삼성전자주식회사 | 서로 다른 홈네트워크에 존재하는 네트워크장치간의접속을 제공하기 위한 장치 및 방법 |
EP1429523A1 (en) * | 2002-12-13 | 2004-06-16 | Alcatel | Public addressing supported by temporary private addressing |
US20040153502A1 (en) * | 2003-02-04 | 2004-08-05 | Luliang Jiang | Enhanced DNS server |
US7944947B2 (en) * | 2003-09-05 | 2011-05-17 | Nokia Corporation | Providing address information for reaching a wireless terminal |
EP1667382A4 (en) * | 2003-09-11 | 2006-10-04 | Fujitsu Ltd | PACKET RELAY DEVICE |
GB2408415B (en) * | 2003-11-19 | 2008-04-09 | Vodafone Plc | Networks |
WO2005074208A1 (ja) * | 2004-01-30 | 2005-08-11 | Matsushita Electric Industrial Co., Ltd. | 情報処理装置、サーバ、通信システム、アドレス決定方法、アドレス変更方法およびプログラム |
US8065418B1 (en) * | 2004-02-02 | 2011-11-22 | Apple Inc. | NAT traversal for media conferencing |
JP4027347B2 (ja) * | 2004-06-04 | 2007-12-26 | キヤノン株式会社 | 情報処理装置、データ通信方法、プログラム及び記録媒体 |
US7912072B1 (en) * | 2004-06-21 | 2011-03-22 | Nortel Networks Limited | Communication with a remote device |
JP2006013827A (ja) * | 2004-06-25 | 2006-01-12 | Hitachi Communication Technologies Ltd | パケット転送装置 |
JP4330520B2 (ja) * | 2004-12-08 | 2009-09-16 | 富士通株式会社 | 通信装置 |
KR100785296B1 (ko) | 2005-07-21 | 2007-12-12 | 삼성전자주식회사 | Voip 게이트웨이에 있어서 데이터 전송 제어 장치 및그 방법 |
KR100736081B1 (ko) * | 2005-11-11 | 2007-07-06 | 삼성전자주식회사 | 웹 서비스 제공 장치, 웹 서비스 요청 장치, 웹 서비스제공 방법 및 웹 서비스 요청 방법 |
US20070115898A1 (en) * | 2005-11-22 | 2007-05-24 | Stein Robert C | Use of wireline networks to access 3G wireless services |
US7609701B2 (en) | 2006-02-22 | 2009-10-27 | Zheng Yang | Communication using private IP addresses of local networks |
JP4238897B2 (ja) * | 2006-08-24 | 2009-03-18 | コニカミノルタビジネステクノロジーズ株式会社 | ネットワークシステム、画像処理装置、及びプログラム |
CN100502367C (zh) | 2007-04-04 | 2009-06-17 | 华为技术有限公司 | 保存域名系统记录的方法、装置 |
CN101340331B (zh) * | 2007-07-06 | 2010-12-08 | 中国电信股份有限公司 | P2p网络中利用空闲终端执行系统任务的方法 |
US7926090B2 (en) * | 2007-07-13 | 2011-04-12 | Erf Wireless, Inc. | Separate secure networks over a non-secure network |
JP5335886B2 (ja) * | 2008-03-20 | 2013-11-06 | テレフオンアクチーボラゲット エル エム エリクソン(パブル) | ローカル・ネットワーク間でデータ・パケットを通信するための方法および装置 |
US8856387B2 (en) * | 2008-04-24 | 2014-10-07 | Qualcomm Incorporated | Local IP access scheme |
US9658891B2 (en) * | 2009-03-13 | 2017-05-23 | Micro Focus Software Inc. | System and method for providing key-encrypted storage in a cloud computing environment |
KR100970367B1 (ko) * | 2008-09-08 | 2010-07-15 | 주식회사 다산네트웍스 | Ip 공유기의 동작 방법 |
CN101605154B (zh) * | 2009-07-09 | 2014-08-13 | 中兴通讯股份有限公司 | 使用网络地址转换的网络设备的ip地址确认系统及方法 |
US8902743B2 (en) * | 2010-06-28 | 2014-12-02 | Microsoft Corporation | Distributed and scalable network address translation |
US8397958B2 (en) | 2010-08-05 | 2013-03-19 | Ds Smith Plastics Limited | Closure valve assembly for a container |
US20120311038A1 (en) | 2011-06-06 | 2012-12-06 | Trinh Trung Tim | Proximity Session Mobility Extension |
US10225354B2 (en) * | 2011-06-06 | 2019-03-05 | Mitel Networks Corporation | Proximity session mobility |
US9100399B2 (en) * | 2012-06-29 | 2015-08-04 | International Business Machines Corporation | Portable virtual systems for composite solutions |
CN103532935B (zh) * | 2013-09-28 | 2017-01-18 | 福建星网锐捷软件有限公司 | 基于域策略的p2p流媒体传输控制方法 |
JP6056795B2 (ja) * | 2014-03-25 | 2017-01-11 | コニカミノルタ株式会社 | 画像処理システム、ゲートウェイ装置、ゲートウェイ装置の制御方法、ゲートウェイ装置の制御プログラム |
JP6536050B2 (ja) * | 2015-02-03 | 2019-07-03 | コニカミノルタ株式会社 | 通信システム、制御装置、通信方法、およびコンピュータプログラム |
JP6311666B2 (ja) * | 2015-07-01 | 2018-04-18 | コニカミノルタ株式会社 | 通信システム、管理サーバおよびプログラム |
JP2021048526A (ja) * | 2019-09-19 | 2021-03-25 | 富士ゼロックス株式会社 | ネットワークシステム、ネットワークオペレーションセンタ、ネットワーク機器及びプログラム |
US10992638B1 (en) * | 2020-06-08 | 2021-04-27 | Amazon Technologies, Inc. | Network address translation based on logical channel implementation in a shared wireless network |
Family Cites Families (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5777989A (en) * | 1995-12-19 | 1998-07-07 | International Business Machines Corporation | TCP/IP host name resolution for machines on several domains |
JP3436471B2 (ja) * | 1997-05-26 | 2003-08-11 | 沖電気工業株式会社 | 電話通信方法及び電話通信システム |
JPH11112577A (ja) | 1997-10-08 | 1999-04-23 | Hitachi Ltd | Lanシステム間相互接続方式及びネットワークサービスシステム |
US6079020A (en) * | 1998-01-27 | 2000-06-20 | Vpnet Technologies, Inc. | Method and apparatus for managing a virtual private network |
JP3581251B2 (ja) * | 1998-06-16 | 2004-10-27 | 株式会社東芝 | 通信システム、データパケット転送方法、ルータ装置及びパケット中継装置 |
US6493349B1 (en) * | 1998-11-13 | 2002-12-10 | Nortel Networks Limited | Extended internet protocol virtual private network architectures |
JP2000228674A (ja) | 1999-02-04 | 2000-08-15 | Nippon Telegr & Teleph Corp <Ntt> | 複数拠点間通信におけるアドレス割り当て方法及び複数拠点間の通信方法並びにその接続装置 |
US6393488B1 (en) * | 1999-05-27 | 2002-05-21 | 3Com Corporation | System and method for supporting internet protocol subnets with network address translators |
US6801523B1 (en) * | 1999-07-01 | 2004-10-05 | Nortel Networks Limited | Method and apparatus for performing internet protocol address resolutions in a telecommunications network |
JP2001053778A (ja) * | 1999-08-05 | 2001-02-23 | Sony Corp | 通信装置および方法、並びに媒体 |
US6523068B1 (en) * | 1999-08-27 | 2003-02-18 | 3Com Corporation | Method for encapsulating and transmitting a message includes private and forwarding network addresses with payload to an end of a tunneling association |
US6781982B1 (en) * | 1999-10-26 | 2004-08-24 | 3Com Corporation | Method and system for allocating persistent private network addresses between private networks |
US6708219B1 (en) * | 1999-10-26 | 2004-03-16 | 3Com Corporation | Method and system for dual-network address utilization |
US6473863B1 (en) * | 1999-10-28 | 2002-10-29 | International Business Machines Corporation | Automatic virtual private network internet snoop avoider |
US6445922B1 (en) * | 1999-12-15 | 2002-09-03 | Lucent Technologies Inc. | Method and system for support of overlapping IP addresses between an interworking function and a mobile IP foreign agent |
KR100598336B1 (ko) * | 1999-12-18 | 2006-07-06 | 주식회사 케이티 | 서비스 게이트웨이를 이용한 인터넷 vpn서비스 제공방법 |
KR100604566B1 (ko) * | 1999-12-22 | 2006-07-31 | 주식회사 케이티 | 세션 에이전트를 이용한 vpn 서비스 제공방법 |
JP3478218B2 (ja) * | 1999-12-27 | 2003-12-15 | 日本電気株式会社 | エッジノード交換機と交換機 |
FR2806246B1 (fr) * | 2000-03-08 | 2005-02-11 | Sagem | Procede d'appel, pour communiquer a travers un reseau informatique, d'un terminal d'un premier reseau cellulaire regional en deplacement dans la region d'un second reseau cellulaire regional |
US6948003B1 (en) * | 2000-03-15 | 2005-09-20 | Ensim Corporation | Enabling a service provider to provide intranet services |
JP2001326693A (ja) * | 2000-05-17 | 2001-11-22 | Nec Corp | 通信装置及び通信制御方法並びに制御プログラム記録媒体 |
KR100422375B1 (ko) * | 2000-08-23 | 2004-03-16 | 큰사람컴퓨터 주식회사 | 상이한 아이피 어드레싱 체계를 갖는 네트워크 환경에접속된 터미널간의 연결을 설정하기 위한 방법 및 시스템 |
AU2001276948A1 (en) * | 2000-08-24 | 2002-03-04 | 2Wire, Inc. | System and method for selectively bridging and routing data packets between multiple networks |
KR100645960B1 (ko) * | 2000-08-29 | 2006-11-14 | 삼성전자주식회사 | 사설망의 네트워크 노드에 접속하기 위한 시스템과 방법 |
KR20020017265A (ko) * | 2000-08-29 | 2002-03-07 | 구자홍 | 동일 아이피 서브넷상에 구성된 서로 다른 가상랜 사이의통신방법 |
US7092390B2 (en) * | 2000-09-07 | 2006-08-15 | Sbc Technology Resources, Inc. | Internal substitution bi-level addressing for compatible public networks |
US20020101859A1 (en) * | 2000-09-12 | 2002-08-01 | Maclean Ian B. | Communicating between nodes in different wireless networks |
US6778541B2 (en) * | 2000-12-01 | 2004-08-17 | Nortel Networks Limited | Dynamic data tunnelling |
US7155518B2 (en) * | 2001-01-08 | 2006-12-26 | Interactive People Unplugged Ab | Extranet workgroup formation across multiple mobile virtual private networks |
US20020103931A1 (en) * | 2001-01-26 | 2002-08-01 | Mott Charles J. | Virtual private networking using domain name service proxy |
TWI223942B (en) * | 2001-02-20 | 2004-11-11 | Li Jian Min | Contents transmission network system and creating method thereof |
US7072323B2 (en) * | 2001-08-15 | 2006-07-04 | Meshnetworks, Inc. | System and method for performing soft handoff in a wireless data network |
JP4186446B2 (ja) * | 2001-09-11 | 2008-11-26 | 株式会社日立製作所 | アドレス変換方法 |
US20030112808A1 (en) * | 2001-12-13 | 2003-06-19 | Net Reality Ltd | Automatic configuration of IP tunnels |
US20030154306A1 (en) * | 2002-02-11 | 2003-08-14 | Perry Stephen Hastings | System and method to proxy inbound connections to privately addressed hosts |
KR100485769B1 (ko) * | 2002-05-14 | 2005-04-28 | 삼성전자주식회사 | 서로 다른 홈네트워크에 존재하는 네트워크장치간의접속을 제공하기 위한 장치 및 방법 |
-
2002
- 2002-03-07 KR KR10-2002-0012219A patent/KR100485801B1/ko active IP Right Grant
-
2003
- 2003-03-05 DE DE60300871T patent/DE60300871T2/de not_active Expired - Lifetime
- 2003-03-05 EP EP03004855A patent/EP1343298B1/en not_active Expired - Fee Related
- 2003-03-06 US US10/379,674 patent/US7290060B2/en not_active Expired - Fee Related
- 2003-03-07 JP JP2003060964A patent/JP3854584B2/ja not_active Expired - Fee Related
- 2003-03-07 CN CNB031068944A patent/CN100366033C/zh not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE60300871T2 (de) | 2005-11-24 |
JP2003273935A (ja) | 2003-09-26 |
KR20030072927A (ko) | 2003-09-19 |
EP1343298A2 (en) | 2003-09-10 |
CN1444366A (zh) | 2003-09-24 |
US20030172184A1 (en) | 2003-09-11 |
US7290060B2 (en) | 2007-10-30 |
EP1343298A3 (en) | 2004-06-30 |
DE60300871D1 (de) | 2005-07-28 |
KR100485801B1 (ko) | 2005-04-28 |
JP3854584B2 (ja) | 2006-12-06 |
CN100366033C (zh) | 2008-01-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1343298B1 (en) | Network-connecting apparatus and method for providing direct connections between network devices in different private networks | |
US7796616B2 (en) | Apparatus and method for offering connections between network devices located in different home networks | |
JP3735348B2 (ja) | インターネットプロトコルアドレス変換装置、これを用いた通信ネットワークシステム及び通信方法 | |
US7106739B2 (en) | Method enabling network address translation of incoming session initiation protocol connections based on dynamic host configuration protocol address assignments | |
US7411967B2 (en) | Private network gateways interconnecting private networks via an access network | |
US6490289B1 (en) | Multiple network connections from a single PPP link with network address translation | |
EP2253123B1 (en) | Method and apparatus for communication of data packets between local networks | |
US6580717B1 (en) | Packet communication method and apparatus and a recording medium storing a packet communication program | |
US6381646B2 (en) | Multiple network connections from a single PPP link with partial network address translation | |
JP3953955B2 (ja) | アクセス・ネットワーク | |
US20030115345A1 (en) | Methods and apparatus for masking destination addresses to reduce traffic over a communication link | |
JP2002502188A (ja) | ネットワーク上のデスティネーションへ送信されたデータの経路決めをするドメイン名を使用するためのシステムおよび方法 | |
WO2005027438A1 (ja) | パケット中継装置 | |
JP2004112801A (ja) | Ipアドレス割当装置及び方法 | |
WO2012013133A1 (zh) | 一种网络通信的方法和设备 | |
US20060268863A1 (en) | Transparent address translation methods | |
JP4571761B2 (ja) | 仮想私設ネットワークにすでに接続されているユーザが、この仮想私設ネットワークに属さない通信デバイスと通信できるようにする方法および対応するネットワークアクセスサーバ | |
KR100587560B1 (ko) | 링크 로컬 주소를 가지는 시스템에서 외부 시스템과통신하는 방법 및 장치 | |
JPH11252172A (ja) | パケット生成方法およびその機能を有する情報処理装置並びにパケット生成プログラムを記録した記録媒体 | |
US20030142684A1 (en) | LAN type internet access network and subscriber line accommodation method for use in the same network | |
US20030172142A1 (en) | Method for building a vapa by using wireless-LAN interface card | |
KR20000046358A (ko) | 라우터에서 인터넷 프로토콜 패킷의 원천지 주소 할당방법 | |
KR20030058267A (ko) | 중간 dhcp 서버를 이용한 중앙집중관리방식의 아이피자동할당 방법 | |
JP2001136198A (ja) | ネットワーク間通信方法およびサーバ装置並びにネットワーク間通信システム | |
Brustoloni et al. | Application-independent end-to-end security in shared-link access networks |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20030305 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
AKX | Designation fees paid |
Designated state(s): DE FR GB |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REF | Corresponds to: |
Ref document number: 60300871 Country of ref document: DE Date of ref document: 20050728 Kind code of ref document: P |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20060323 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 14 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 15 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20170221 Year of fee payment: 15 Ref country code: FR Payment date: 20170223 Year of fee payment: 15 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20170222 Year of fee payment: 15 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 60300871 Country of ref document: DE |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20180305 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20181002 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20180305 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20180331 |